Then there are those occasions where an episode is filmed and has to be permanently shelved due to unintentional connections to real-world tragedies. In these scenarios, the episodes are not strictly speaking “lost” – but they’ll never see the light of day as originally planned.

And lastly, sometimes episodes are scripted but ultimately abandoned prior to filming. As they were never filmed, these are in some ways the most truly “lost episodes” – considering fans will never, ever get to see them!

Regardless the reason behind why an episode is lost, the end result is always the same: TV fans are left fascinated – or even frustrated – by the gaps left behind in their favorite shows.

In honor of these missing pieces of television history, we’ve pulled together this list of 16 TV Shows With Lost Episodes.